Question about 2003 GMC Sierra 2500HD

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'03 GMC 2500HD 4x4 problems

Light on push buttons went out and the ''service 4x4 went across the dash computer. Truck went into limp mode and won't go over 2000 rpm. Shut truck off and wait. Restart and same thing. Allison trans 8.1L engine ext. cab short bed.

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Take your positive cable off battery and wait a few minutes..This resets the computer and takes it out of limp mode.Theres been a lot of problems in the dash so if you can find an auto zone and have them scan it They'll do it for free.But as far as the lights my truck does the same thing. Just flick your fingers on the buttons and they should flash..The plug in the back of buttons was loose..

Posted on Mar 29, 2009

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